Electric fuse



Patented Jan. 26, 1926.

anon-en 1-1. srmv, or SPENCER, IOWA.

ELECTRIC FUSE.

Application filed March 7, 1923.

1 0 all ii /1 0m art may (IOI'LCKHHJ Be it known that l, Gnonon H. SINN, a euiarn of the United States, residing at Spencer, in the county of Clay and State of Iowa, have invented certain new and useful lmproven'ients in an Electric Fuse, of which the following is a specification.

This invention relates to electric fuses, es pecially adapted to be arranged in polyphased circuits, for the protection of polyp hased mpto'rs, toprevent them from running single-phased, and has for its object the construction of a fuse comprising a plurality of fusestrips, one of each phase of the circuit each confined in an enclosing case and insulated from each other, portions f said strips being more or less closely asso'ciated together in a common fusing Zone, "to form a short-circuiting means whereby fusing of any one of the fuse strips will result in the rupture of the adjacent strip or strips.

Another object of the invention is to provide a small closed chamber at the fusing zone of the fuse strips whichwill confine, at least temporarily, the conducting gases produced by the fusing of any fuse strip, which conducting gases will short circuit the adjacent strip or strips, causing them to ruptura Still another object of the invention is to provide the fuse strips with reduced portions for insuring the fusing 0f the strips upon a given over-load, and for localizing the fusing zone at the chamber and in providing said strips with other reduced portions for insuring the blowing of the fuse upon a reater over-load and for localizing said blow-out at points outside of the chamher but within the insulating enclosing case. And a still further object of the invention to provide an electric fuse of the cha acter indicated, which is simple in construction, durable, efficient for the purpose intended, and one that can be manufactured and sold at a very low cost.

Referring to the accompanying drawings which form a part of this specification, and which clearly show the construction of my improved fuse,

Figure 1 is a side elevation, partly in section, of a fuse constructed in accordance with my invention, and

Figure T2 is a side elevation, partly in section, which better illustrates the construction of my improved false.

Serial No. 623,483.

Referring to the accompanying drawings, like characters will be used to designate like parts in the different views.

In the drawings, the numeral 1 indicates gas-proof case, of which there are three in number and are adapted to be connected as will be hereinafter described. Each of the gas enclosed chambers is provided with a to) and bottom cap 2 and 8 respectively, w llCll permit entrance to the interior of the gas enclosing casings. Positioned within each of the casings 1 is a strip of fusible material at, the line wires being connected to each of the strips of fusible material as at 5, while the load is connected as at 6. In order to permit burning out of the strips of fusible material in case the same should become over-loaded, each is provided with a weak portion 7 intermediate the ends of same.

Secured to one side of each strip of fusible material is a non-fusible material 8 and secured to the outer side of each of the nonfusihle materials is a layer of carbon 9. As a matter of illustration three fuses are shown, the same being designated by the letters A, B, and C. A wire 10 is connected at one end, as at 11, to the carbon of the fuse C of the series and the opposite end of the wire is connected, as at 12, to the strip of fusible material in the fuse B of the series, and a wire 13 is connected, as at 14, to the carbon of the fuse B, while the opposite end of the wire 13 is connected, as at 15, to the strip of fusible material in the fuse A of the series. A wire 16 is adapted to connect the carbon of the fuse A of the series with the strip of fusible material contained in the casing of the fuse C of the series, as at 17.

If the strip of fusible material in the fuse (l of the series should blow out, it will are through the opening in the non-fusible material and come in contact with the carbon and the carbon being in circuit with the fuse B through the wire 10 will cause the strip of fusible material in fuse B to also be blown out. When the same action takes place in fuses A and B, it will are through out first, the same will. blow out fuse A through the wire 13, while the wire 16 will cause fuse C to blow out. IVith this improved arrangement of fuses, itwill eliminate the trouble of trying to start a motor on two fuses, which results in burning out of the inotor.

In View of the foregoing description of my invention taken in connection with the accompanying drawings,- it is thought that any further explanation as to the construction, operation and objects of the invention is unnecessary, V 7

While I have shown and described the preferred form of my invention, I realized that various minor changes may be resorted to, without departingfrom the spirit and scope of the invention asclaim'echand therefore, I do not wish to. limit myself to the exact details of construction shown, nor to tire combination and arrangement of parts.

hat Iclaim as new and desire to secure by Letters Patent is: a y 7' 1. An electricfuse comprising a series of casings, a fuse mounted inv each casing, means for connecting said fuses to close a .circuit to overload the other fuses and cause casings, a fuse mounted in each casing, a

conductor positioned in each casing spaced from said fuse, and means for connecting the conductor in each of said casings to a fuse in another casing of said series to blow out all of said fuses upon the blowing out of any one of said fuses in said series.

In an electric fuse comprising a series of fuses, a gas enclosing chamber adapted to have one of said fuses mounted therein, a strip of non-fusible material carried by each fuse, a layer of carbon applied to the surface of each strip of non-fusible material, and means for connecting said fuses through said carbon and non-fusible material to blow out said fuses upon the over-loading of any one of said fuses in said series.

4:. An electric fuse comprising a series of gas enclosing casings, a fuse mounted in each casing, a strip of non-fusible material having an opening therein carried by each fuse, a layer of carbon applied to the surface of each. strip of non-fusible material covering the opening therein, each of said fuses being reduced in thickness adjacent said openings, and means for connecting the carbon in each casing to a fuse in another casing so that all of said fuses will be connected, each of said fuses forming a contact with the layer of carbon through the open ing in the non-fusible material to blow all of said fuses in said series when one of said fuses has been blown.

In testimony whereof, I have aflixed my 

